This ain't your mother's 50k 2027
The forecast arrives five days before the start.
Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 9 aid stations to plan your nutrition and hydration segment by segment.
What's your time based on your UTMB?
Times estimated by the RAVIT model, learned from real ultra-trail finish times. Enter your UTMB Index (utmb.world) to get a personalized estimate.
Cut-off times and crew - This ain't your mother's 50k · 2027
Data from the official race rules, checked for every edition. The race rules prevail. Positions are interpolated along the GPX track and are a guide, not official course marking.
What you'll find at each aid station
| Product | Powell Fordkm 7.7 | 4 Waykm 11.8 | Ellis Fordkm 17.3 | Knight's Landingkm 20.8 | Indian Fordkm 24.6 | Knight's Landing Returnkm 28.5 | Ellis Ford Returnkm 32.0 | 4 Way Returnkm 37.5 | Powell Fordkm 41.6 |
|---|---|---|---|---|---|---|---|---|---|
| Water | available | available | available | available | available | available | available | available | available |
| Brand products | available | available | available | available | available | available | available | available | available |
La feuille de ton assistance pour This ain't your mother's 50k · 2027
Les règles d'assistance de cette course ne sont pas encore connues : tu marqueras tes rendez-vous toi-même.
Recto, verso et planche d'étiquettes, en PDF : l'exemple d'une coureuse de l'UTMB.
Elevation profile
The course and its aid stations
This ain't your mother's 50k: times, aid-station stops and fuelling needs by UTMB® Index
Between a UTMB® Index of 500 and 800, the estimated finish time on this race runs from 5h30 to 3h28, and the aid-station stop budget from 0h12 to 0h04. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Source
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium |
|---|---|---|---|---|---|---|
| 500 | 5h30 | 0h12 | — | 330 g | 3.9 L | 2,750 mg |
| 550 | 5h03 | 0h10 | — | 303 g | 3.5 L | 2,524 mg |
| 600 | 4h36 | 0h08 | — | 276 g | 3.2 L | 2,299 mg |
| 650 | 4h16 | 0h07 | — | 256 g | 3 L | 2,131 mg |
| 700 | 3h58 | 0h06 | — | 238 g | 2.8 L | 1,980 mg |
| 750 | 3h42 | 0h05 | — | 222 g | 2.6 L | 1,850 mg |
| 800 | 3h28 | 0h04 | — | 208 g | 2.4 L | 1,732 mg |
Figures based on 60 g of carbohydrate, 700 mL of fluid and 500 mg of sodium per hour, "average" preparation and mild conditions (15–25 °C). Above 25 °C, count on roughly 900 mL/h and 700 mg/h. Carbohydrate intake is trained: 60 g/h is a floor, 90 g/h assumes a glucose-fructose blend and a gut used to it.
In the 2027 ranking
This ain't your mother's 50k is 49 km and 362 m of elevation gain, that's 52 km-effort: category S, among 163 races in 2027. Its time limit is not yet published: minimum speed unknown.
S trails 2027: 45 to 74 km-effort
Similar effort in 2027
- Istria 100 - 42K · 52 km-effort
- Val Maremola Trail ed.15 - Val Maremola Long Trail ed.15 · 52 km-effort
- Trails De La Vallée Du Brevon - AlloDuoTrail - relais 1 · 52 km-effort
Other trails worth preparing for
- Javelina Jackass 31k31 km · 322 m D+ · October 31, 2026
- Coldwater 50k52 km · 1,293 m D+ · November 1, 2026
- New York Marathon42 km · 209 m D+ · November 1, 2026
- Mt Laguna Trail Marathon43 km · 938 m D+ · November 1, 2026
- Lake Chabot 50K49 km · 1,896 m D+ · November 7, 2026
- Mt. Tam 50k48 km · 2,005 m D+ · November 7, 2026
- Deception Pass 50k50 km · 1,394 m D+ · November 7, 2026
- Red Rock Canyon 50k49 km · 988 m D+ · November 14, 2026
- HOKA Pacific Trails California by UTMB - 50K®52 km · 1,548 m D+ · November 14, 2026
Sources and method
- Time projection — times by UTMB Index are taken from the actual splits of runners in each level band on previous editions of this race, aid station stops included. No formula is used as long as these results exist.
- Trail nutrition — hourly targets for carbohydrate, fluid and sodium follow the commonly accepted ultra-endurance guidance. La Clinique du Coureur — Fuelling in trail running
- Course, aid stations and cut-offs — taken from the event's official rules, which prevail in case of any discrepancy. Official site — This ain't your mother's 50k
Weather for This ain't your mother's 50k
The weather for This ain't your mother's 50k will appear here as soon as the forecast models reach that date, around five days before the start: feels-like temperature, rain, snow, wind and storms, section by section and at your passage time.
Detailed weather for This ain't your mother's 50k, hour by hour on the courseFrequently asked questions
How many checkpoints?
This ain't your mother's 50k has 10 checkpoints: 9 aid stations and 1 checkpoint with undocumented contents. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Powell Ford: 7.7 km and 30 m elevation gain. That's the one to load up for first.
How do I find the exact location of an aid station?
The Google Maps icon in the “Access” column opens the aid station's location: handy for planning your crew's routes.
What distance and elevation gain?
This ain't your mother's 50k is 49 km long with 362 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 4h36 for This ain't your mother's 50k.
What's the weather forecast?
The weather for This ain't your mother's 50k will be published on this page around five days before the start, once the forecast models reach the race date. It will be detailed section by section: feels-like temperature, rain, snow, wind and storms.
Want to stack the odds in your favor for This ain't your mother's 50k?
In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.
No card required · Instant results